We have a problem that I hope someone can help.I have a 72 that has 345/30-18 on it.  The tires are 10 years old and need to be replaced.What are my opions to replace them. Can we still find 345"s?The car has 285's in the front and the 345's in the rear. Steven Edwards We have a problem that I hope someone can help. I have a 72 that has 345/30-18 on it. The tires are 10 years old and need to be replaced. What are my opions to replace them. Can we still find 345"s? The car has 285's in the front and the 345's in the rear. Steven Edwards